The last scene of the play begins as follows: "The moon shines bright. In such a night as this, / When the sweet wind did gently kiss the trees / And they did make no noise, in such a night / Troilus methinks mounted the Trojan walls / And sighed his soul toward the Grecian tents / Where Cressid lay that night"(MV5.1.1-6). Shakespeare chose this beginning, with it's classical allusions, to further suggest recollection of the conclusion of THE ODYSSEY I should think. Portia's purpose, as in the conclusion of the Homeric poem, is as arbiter.